I thought I would hold back any analysis of this graph to see if anyone else had insights. I guess I over-estimated an interest-level in Wisconsin considering the massive malaise we are all experiencing now. Understandable.
Well, looking at this graph, one thing that stands out to me is the gradual decrease in talent on Bielema's teams. His frustration in trying to improve recruiting comes to mind. If I remember right, he wanted to pay his assistants more competitive salaries in order to keep the best coaches (and recruiters) on staff. It is hard to evaluate trends with Andersen based on only two seasons, but he also was frustrated with the limits of recruiting in terms of academic standards IIRC.
Another Interesting thing is Bert's on-field results in the early part of his tenure. First year success, followed by a two-year nose-dive. the three-year trend looks rather disturbing, not knowing the success he was to have in the following three years. Alvarez stuck with him, and was rewarded.
I'm not making a comment on Nebraska based on that, but I do think that "down years" happen everywhere. Sh1t happens sometimes.